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A signal is a stream of information in the form of a varying quantity. Usually in electronics, signals can be in the form of voltages, currents, or radiated electromagnetic fields.

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How is electromagnetic interference possible when measuring voltage difference?

It is the pesky slow speed of light that causes these kinds of problems. It causes the physical lengths and shapes of the conductors to form antennas allowing radio frequency (RF) energy to be absorbe …
Joanna McLellan's user avatar